Giant Sunflower Seeds for Planting - Heirloom & Non-GMO - High Germination Seeds Shipping Policy: All orders are shipped out via USPS First Class mail on the next business day. However, only orders $10 or more will receive a tracking number. View our store for more than 100 other garden seed options! Name:Mammoth Grey Stripe Sunflower Life Cycle: Annual Type: Heirloom Non-GMO Open Pollinated Plant Height: 9-12 feet Days to Maturity: 90-110 Days Light Requirement: Full Sun Planting Season: Spring Blooms: Summer/Fall Planting Depth: 1/2 inch Plant Spacing: 12-18 inches Weight: .2oz Origin: US Lot # 30829-17614 Germination Rate: 85% Best If Used By 11-30-2024